Oliver works at a bookstore. he packed 20 identical paperbacks and 9 identical textbooks in a box. the total mass of the books was 44.4 pounds. after he put 1 more textbook and 5 more paperbacks in the box, the total mass of the books was 51 pounds.

write a system of equations that can used to determine p, the mass, in pounds, of one paperback, and t, the mass, in pounds of one textbook.

In the problem, the first equation should be represented like this base on the variable given in the problem:

20p + 9t = 44.4

with that equation, the second equation would is given by this formula, in response with the additional number of paperback and textbook

21p + 14t = 51

to get the system equation in getting the mass of each variable, you should subtract the two equation to simplified the formula.

   20p + 9t = 44.4
 - 21p + 14t = 51

p + 5t = 6.6 // this is the system equation that could be use in getting the mass of each object